A86/100
CLARK — Water Quality Report 2026
Serving 1,148 people · South Dakota
Water Source
Purchased Groundwater
County
—
System ID
SD4600091
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2016.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CLARK
Is CLARK water safe to drink?
CLARK water receives a grade of A (86/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CLARK detected?
1 contaminants were tested in CLARK's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CLARK have any EPA violations?
Yes, CLARK has 7 EPA violation(s) on record, with the most recent in 2016. Violation types include TT, Other, MR. 1 are health-based violations.
How many people does CLARK serve?
CLARK serves approximately 1,148 people, South Dakota. The system provides water to 1 community: Clark.
What type of water does CLARK provide?
CLARK sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is SD4600091.
How does CLARK compare to other utilities in South Dakota?
CLARK scores 86/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our South Dakota state page for a full comparison of water systems.